三角形链式STATCOM电流补偿模式下的控制策略

Control Strategies of the Cascaded STATCOM with Delta Configuration in Current Compensation Mode

三角形链式静止同步补偿器(STATCOM)工作于电流补偿模式时,可以对负载的无功、不平衡和谐波电流进行综合治理。其相电流指令直接关系到链节直流侧电压稳定和链节额定电流水平。将相电流指令分为基波正序无功分量、基波负序分量和谐波分量,通过叠加零序分量使链节有功为零,推导了零序分量与负序分量之间的关系。对负序电流的补偿不能超过额定电流的50%。在Matlab/Simulink中搭建了7电平STATCOM仿真模型,仿真结果验证了控制策略的正确性和有效性。

The cascaded static synchronous compensator(STATCOM)with delta configuration in current compensation mode can compensate reactive,unbalanced and harmonic current of the load. The phase reference current is directly related to the DC link stability and the rated current. The phase reference current was divided into fundamental positive sequence reactive component,fundamental negative sequence component and the harmonics. By adding zero sequence component to the reference current,zero active power in each phase could be obtained. The relationship between zero sequence component and negative sequence component was derived. The negative sequence current compensation could not exceed half of the rated current. A seven-level STATCOM simulation model was built in Matlab/Simulink. The simulation results verify the correctness and effectiveness of the control strategies.